with \(\nu =R_{b}/R_{a}\) , where \(R_{X}\) , \(R_{a}\)  and \(R_{b}\)  are the
resistances in an operational amplifier. We note that the resistors in the
operational amplifier circuit are tuned to be \(\nu =1\)  in the literature[1]}
so that the system becomes Hermitian, where the corresponding
Hamiltonian represents a spin-orbit interaction. It produces the Hamiltonian
\(H=\frac{1}{\omega R_{X}}\left(\begin{array}{cc}i & -i \\i & -i\end{array}\right)\) 
